Ti Tree Gas to Energy Project

Ti Tree Gas to Energy Project is a landfill gas project located at the Ti Tree Bioenergy facility in Willowbank, approximately 15km south of Ipswich and 50km southwest of Brisbane in Queensland. Registered in November 2012, the project operates within a former open-cut coal mine void that has been converted into a bioreactor landfill. The surrounding Willowbank region is characterized by a mix of industrial land uses, including the well-known Willowbank Raceway, alongside traditional grazing and rural residential properties.

The project operates under the Carbon Credits (Carbon Farming Initiative, Landfill Gas) Methodology Determination 2015. This methodology credits the capture and combustion of methane generated from decomposing organic waste in landfills. By converting methane, a potent greenhouse gas, into carbon dioxide through flaring or electricity generation, the project significantly reduces the facility's global warming potential. The Ti Tree facility specifically utilizes bioreactor technology, which accelerates waste decomposition and gas production to fuel on-site power generation units, contributing renewable energy to the grid.

Environmental conditions in the Ipswich region are subtropical, typically receiving moderate to high rainfall which aids the bioreactor processes. The local geology and soils are heavily influenced by the Walloon Coal Measures, predominantly consisting of clays and silty clays with high plasticity. Notably, the project represents a successful example of rehabilitating a legacy mining void (the former Sir Lancelot coal mine) into a productive bioenergy asset. The project was contracted by the Australian Government in April 2015 and successfully completed its contract obligations in August 2022.